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FIGURE 2
Dark lines depict the boundaries of
the submental (IA) and anterior
compartment (VI) lymph nodes.
FIGURE 3
The boundaries dividing levels I, II,
and V into sublevels A and B.
VI
IA
IV
I II
III
V
V
I
II
A
B
A
B
A
B
metastases from cancers arising from the oral cavity, nasopharynx, orophar-
ynx, hypopharynx, and larynx (Figure 3).
D. Level IV: Lower Jugular Group
This group consists of lymph nodes located around the lower third of the
internal jugular vein extending from the inferior border of the cricoid (above)
to the clavicle (below). The anterior (medial) boundary is the lateral border of
the sternohyoid muscle, and the posterior (lateral) boundary is the posterior